Attachment for rivet-setting machines



March 10, 1925- E. B. STIMPSON ATTACHMENT FOR RIVET SETTING MACHINES Original Filed 26 1921 2 Sheets-Sheet [Ir-l.

March 10, 1925- 1,528,897 E. B. STIMPSON ATTACHMENT FOR RIVET SETTING MACHINES Original Filed Nov. 26, 1921 2 Sheets-Sheet 2 @Woz 9% em 1 Patented Mar. 10, 1925.

UNITED STATES PATENT OFFICE. I

EDWIN B. STIMPSON, E BROOKLYN, NEW YORK, ASSIGNO'R T0 EDWIN B. STIMPSON COMPANY, OF-BROOKLYN, NEW YORK.

ATTACHMENT FOR RIVET-SETTING MACHINES.

Original application filed November 26, 1921, Serial No. 517,919. Divided and this application filed 7 April 17, 1923. Serial No. 632,715.

To all whom it may concern) 7 Be it known that I, EDWI B. STIMrsoN, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful. Improvements in Attachments for Rivet-Setting Machines, of which the following is a specification.

This invention relates to attachments for rivet-driving machines in which the shanks of the rivets are slitlengthwise to form bifurcations; and the presentapplication has for its object to disclose and claim, in a divisional application based on my copending application Serial No. 517,919 filed November 26, 1921, such an attachment, and one whereby the slit rivets may be fed beneath the driving plunger of the machine so that the jaws or bifurcations of all of the rivets will be similarly. positioned, i. e., all of the slits will occupy substantially the same Other ob'ects and. advantages will here-' inafter appear.

In the accompanying drawings:

Figure 1 is a front elevation of a portion of a rivet-driving machine .with'the invention applied thereto;

Figure 2 is a side View of the device shown in Figure 1;

Figure 3 is an enlarged detail view of the invention applied to the machine and showing the driving plunger in lowered pos1- tiion;

Figure 4 is a view similar to Figure 3 but showing the driving plunger in elevated position;

Figure 5 is a plan view, partly sectioned, of the parts shown in Figures 5 and 6; and

Figure 6 is a front and side'elevation of the tip of the operating spring.

Referring to the-drawings, there is shown rivet-driving machine of the usual type plane.

"driven through article 13 and the jaws of the rivet are spread upon the opposite face of the article. The rivets are fed to the driving position beneath plunger 10 and between guides 11 in the usual manner by allowing the rivets to pass down an inclined guide-way 20, upon which they are supported by their heads, until they rest above a horizontal slot 21 inwhich operates a slide .Said slide has a vertical opening 23 therein large enough to receive the lowermost rivet in guide-way 20, and said slide is so connected with the plunger that every time the latter operates to drive a rivet into an article the slide is moved over until the rivet held therein isdirectly over an inclined slot 25 which terminates adjacent the plunger whenthe latter is in lowered position. (See Fig. \Vhen the plunger is elevated it rises above the lower end of slot 24 and permits the rivet held in the end of the slot to drop betweenguides 11 into the driving position. As the plunger descends, another rivet is'fed by slide 21 into slot 24, said rivet moving to the lower end of slot 21 and abutting against the plunger. The action is then repeated. 7 The hereinbefore de-' scribed structure is usual in rivet-driving machines. I

It is desirable, as previously pointed out, that the rivets be fed to the driving position with their jaws similarly positioned, i. e., with the slits in substantially the same For this purpose there is provided a device which operates to position the rivets properly as each rivet reaches the bottom of slot 24 adjacent the lowered plunger in position to drop to driving position when the plunger is raised. Each rivet is similarly positioned by this device so that when it drops to driving position the place of the slits will be in substantially the same posi tion in every case. The device comprises an operating member in the form of a flat portion having a. point or tip 51 fixed near one end of a spring member 52 whose other end is attached to the machine frame. The plunger 10 is provided with a pin 57 which, when the plunger rises, engages one arm 56 of a lever pivoted at 57 on the machine frame. The end of the other arm 58 of said lever engages a. corrugated portion 39 formed in spring member 52, so that as the plunger rises, arm 58 will rotate downardly from a substantially horizontal position thus causing its end to move inwardly toward the machine and permitting port-ion 50 to move further into the rivet slit. the end of arm 58 moves over the corrugations, the portion 50 will be alternately pressed awayfrom the rivet slit and permitted to, spring into said slit, thus causing an intermittent movement. \Vhen the plungcr descends, a spring of any ordinary type may be provided to restore arm 58 to its raised position, overcoming spring 52 to force the latter to ineffective (or Fig. 3) position. i The tip 51 on the free end of spring 52, when the lever is operated as above, contacts with the rivet at the end of the slot waiting to be dropped to driving position when plunger 10, rises. By repeatedly operating flat.- portion 50 back and forth into and out of contact with the slit end of the rivet-shank, the tip 51, which is necessarily a wedge and twisted slightly to. form a screw or spiral, works its way into the rivet slit, and the flat portion o0 exerts a camming action on the rivet until the plane of the slit coincides with the plane of the portion 50. The portion 50 may then oprate in and out of. the slit freely. The same action is exerted. upon each rivet as it. comes to position at theend of slot 25. By the time plunger 10 rises above the end of slot 25, lever 56 has been actuated back and forth several times and the rivet-slit has been brought into the plane of portion 50 by the camining action of said portion. Each rivet is therefore similarly disposed as it drops to driving position beneath the plunger.

Variations may be resorted to within the scope of the annexed claims.

I claim:

1. In a rivet-driving machine having means for feeding the rivets to a point adjacent the driving position, each of said rivets having a slit lengthwise through the shank thereof to form bifurcations, means mounted upon said machine for positioning said rivet-s when adjacent the driving position so that the slits and the bifurcations of the rivets are similarly disposed, said means including a spring member fixed at one end tothe machine and carrying a flat member at its other end, and means for intermittently operating said spring member to cause said flat member to enter the.

slits in the rivets to bring said slits into the plane of said flat member.

2. In a rivetdriving machine having means for feeding the rivets to a point adjacent the driving position, each of said rivets having a slit lengthwise through the shank thereof to form bifurcations, means mounted upon said machine for positioning the rivets when adjacent the driving position so that the slits and the bifurcations of the rivets are similarly disposed, said means including a spring member fixed at one end to the machine and carrying a flat member at its other end, said spring member normally pressing said fiat member toward the slits in the rivets, said ma chine having a driving plunger, and a movable member mounted on said machine and operated by said plunger and engaging said spring member to operate said flat member intermittently to cause said flat member to enter the slits in the rivets to bring said slits into the plane of the flat member,

3. In a rivet-driving machine having means for feeding the rivets to. a point adjacent the driving position, each of said rivets. havinga slit lengthwise through the shank thereof to form bifurcations, means mounted upon said machine for positioning the rivets when adjacent thev driving position so that the slits and the bifurcations. of the. rivets are similarly disposed, said means including a corrugated spring member fixed at one end to the machine and carrying a flat member-at its other end, said spring member normally pressing said flat member towards the slits in the rivets, said machine having a driving plunger, and. a

movable member mounted on said machine.

and operated by said plunger and engagmg said corrugations to operate said flat member intermittently to cause said flat member to enter the slits in. the rivets to bring said slits into the plane of said flat member.

4. In a rivet-driving. machine having means for feeding the rivets to a point ad jacent the. driving position, each of said rivets having a slit lengthwise through. the shank thereof to form bifurcations, and means mounted upon said machine for positioning the rivets when adjacent the driving position so that the slits and the bifurcations ofethe rivets are similarly disposed,

said means including a spring member fixed at one end and carrying a fiat member at its other end, said machine having a driving plunger, and a lever mounted on said ma chine and operated by said plunger at one end, said spring member having corrugations positioned progressively farther from the machine, the other end of said lever engaging said corrugations in succession, when said plunger rises, to operate said flat member intermittently and to an increasing degree to cause said flat member to enter the slits in the rivets to bring said slits into the plane of said flat member.

5. In a rivet-driving machine having means for feeding rlvets to a point ad acent the driving position, each of said rivets having a slit lengthwise through the shank thereof to form bifurcations, means mounted upon said machine for positioning the rivets When adjacent the driving position so that the slits'and the bifurcations of the rivets are similarly disposed, said means including an anchored spring member carrying a fiat portion, said spring member normally pressing said fiat portion toward the slits in the rivets, said machine having a driving plunger, and a member movably mounted on said machine and operated by said plunger, said spring member having corrugations positioned progressively farther from the machine, said movably mounted member engaging said corrugations in succession, When said plunger rises, to reciprocate said fiat portion by strokes of increasing length to cause said flat member to enter the slits in the rivets to bring said slits into the plane of said flat member, and means for restoring said member to initial position and for disengaging said flat portion from the slits when said plunger descends.

In testimony whereof I affix my signature.

EDWIN B. STIMPSON. 

